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Selenium analysis in waters. Part 2: Speciation methods.

Kelly L LeBlanc1, Paramee Kumkrong1, Patrick H J Mercier1

  • 1National Research Council Canada, 1200 Montreal Road, Ottawa, Ontario, Canada.

The Science of the Total Environment
|June 25, 2018
PubMed
Summary
This summary is machine-generated.

Selenium speciation is crucial for understanding aquatic toxicity, as total selenium concentration doesn't correlate with environmental effects. Analyzing different selenium species provides vital data for regulators and industry decision-making.

Keywords:
BioremediationChromatographyMass spectrometrySelective sequential hydride generationSolid phase extraction

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Ecotoxicology

Background:

  • Total selenium concentration in water often fails to predict toxic effects in aquatic ecosystems.
  • Bioavailability of various selenium species varies significantly, impacting aquatic organisms.
  • This review follows a previous article on selenium analysis methodologies and regulatory frameworks.

Purpose of the Study:

  • To review the current state of selenium speciation analysis.
  • To highlight the importance of speciation data for industry decision-makers and regulators.
  • To discuss methods for selenium fractionation and discrete speciation.

Main Methods:

  • Detailed examination of fractionation methods, including selective sequential hydride generation.
  • Analysis of advantages and limitations of fractionation methods (detection limits, interferences).
  • Discussion of discrete speciation methods (separation techniques) and implementation challenges.

Main Results:

  • Fractionation methods can overestimate or underestimate selenium fractions due to conversion steps.
  • Discrete speciation methods are important for analyzing individual selenium species but present implementation difficulties.
  • Biological treatment methods for selenium remediation are reviewed, with emphasis on speciation's role.

Conclusions:

  • Selenium speciation analysis is essential for accurate risk assessment and effective environmental management.
  • Understanding selenium species is critical for the successful application of bioremediation techniques.
  • Speciation data informs regulatory decisions and industrial practices for selenium management in aquatic environments.